2022ApJ...941...51H

Query : 2022ApJ...941...51H

2022ApJ...941...51H - Astrophys. J., 941, 51 (2022/December-2)

The JCMT BISTRO Survey: A Spiral Magnetic Field in a Hub-filament Structure, Monoceros R2.

HWANG J., KIM J., PATTLE K., LEE C.W., KOCH P.M., JOHNSTONE D., TOMISAKA K., WHITWORTH A., FURUYA R.S., KANG J.-H., LYO A.-R., CHUNG E.J., ARZOUMANIAN D., PARK G., KWON W., KIM S., TAMURA M., KWON J., SOAM A., HAN I., HOANG T., KIM K.H., ONAKA T., ESWARAIAH C., WARD-THOMPSON D., LIU H.-L., TANG X., CHEN W.P., MATSUMURA M., HOANG T.D., CHEN Z., LE GOUELLEC V.J.M., KIRCHSCHLAGER F., POIDEVIN F., BASTIEN P., QIU K., HASEGAWA T., LAI S.-P., BYUN D.-Y., CHO J., CHOI M., CHOI Y., CHOI Y., JEONG I.-G., KANG M., KIM H., KIM K.-T., LEE J.-E., LEE S.-S., LEE Y.-H., LEE H., KIM M.-R., YOO H., YUN H.-S., CHEN M., DI FRANCESCO J., FIEGE J., FISSEL L.M., FRANZMANN E., HOUDE M., LACAILLE K., MATTHEWS B., SADAVOY S., MORIARTY-SCHIEVEN G., TAHANI M., CHING T.-C., DAI Y.S., DUAN Y., GU Q., LAW C.-Y., LI D., LI D., LI G., LI H.-B., LIU T., LU X., QIAN L., WANG H., WU J., XIE J., YUAN J., ZHANG C.-P., ZHANG G., ZHANG Y., ZHOU J., ZHU L., BERRY D., FRIBERG P., GRAVES S., LIU J., MAIRS S., PARSONS H., RAWLINGS M., DOI Y., HAYASHI S., HULL C.L.H., INOUE T., INUTSUKA S.-I., IWASAKI K., KATAOKA A., KAWABATA K., KIM G., KOBAYASHI M.I.N., NAGATA T., NAKAMURA F., NAKANISHI H., PYO T.-S., SAITO H., SETA M., SHIMAJIRI Y., SHINNAGA H., TSUKAMOTO Y., ZENKO T., CHEN H.-R.V., DUAN H.-Y., FANCIULLO L., KEMPER F., LEE C.-F., LIN S.-J., LIU S.-Y., OHASHI N., RAO R., TANG Y.-W., WANG J.-W., YANG M.-Z., YEN H.-W., BOURKE T.L., CHRYSOSTOMOU A., DEBATTISTA V., EDEN D., EYRES S., FALLE S., FULLER G., GLEDHILL T., GREAVES J., GRIFFIN M., HATCHELL J., KAROLY J., KIRK J., KONYVES V., LONGMORE S., VAN LOO S., DE LOOZE I., PERETTO N., PRIESTLEY F., RAWLINGS J., RETTER B., RICHER J., RIGBY A., SAVINI G., SCAIFE A., VITI S., DIEP P.N., NGOC N.B., TRAM L.N., ANDRE P., COUDE S., DOWELL C.D., FRIESEN R. and ROBITAILLE J.-F.

Abstract (from CDS):

We present and analyze observations of polarized dust emission at 850 μm toward the central 1 × 1 pc hub-filament structure of Monoceros R2 (Mon R2). The data are obtained with SCUBA-2/POL-2 on the James Clerk Maxwell Telescope (JCMT) as part of the B-fields in Star-forming Region Observations survey. The orientations of the magnetic field follow the spiral structure of Mon R2, which are well described by an axisymmetric magnetic field model. We estimate the turbulent component of the magnetic field using the angle difference between our observations and the best-fit model of the underlying large-scale mean magnetic field. This estimate is used to calculate the magnetic field strength using the Davis-Chandrasekhar-Fermi method, for which we also obtain the distribution of volume density and velocity dispersion using a column density map derived from Herschel data and the C18O (J = 3 - 2) data taken with HARP on the JCMT, respectively. We make maps of magnetic field strengths and mass-to-flux ratios, finding that magnetic field strengths vary from 0.02 to 3.64 mG with a mean value of 1.0 ± 0.06 mG, and the mean critical mass-to-flux ratio is 0.47 ± 0.02. Additionally, the mean Alfvén Mach number is 0.35 ± 0.01. This suggests that, in Mon R2, the magnetic fields provide resistance against large-scale gravitational collapse, and the magnetic pressure exceeds the turbulent pressure. We also investigate the properties of each filament in Mon R2. Most of the filaments are aligned along the magnetic field direction and are magnetically subcritical.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Star formation - Magnetic fields - Polarimetry - Molecular clouds - Submillimeter astronomy

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 1333 OpC 03 29 09.2 +31 20 59           ~ 1575 1
2 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 350 0
3 NAME California Molecular Cloud MoC 04 10.0 +39 00           ~ 188 1
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
5 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
6 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1498 0
7 NAME Mon R2 IRS 1 cor 06 07 46.20 -06 23 09.5           B0 65 0
8 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
9 RCW 97 HII 15 53 05.0 -54 35 24           ~ 171 0
10 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
11 NGC 6334 HII 17 20 53 -36 07.9           ~ 740 0
12 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
13 NAME Galactic Circumnuclear Disk PoG 17 45 40.0 -29 00 28           ~ 187 0
14 GAL 012.89+00.49 HII 18 11 51.3 -17 31 29           ~ 217 0
15 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
16 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1195 1
17 NAME Serpens South molecular cloud MoC 18 30 -02.0           ~ 116 0
18 IRAS 18449-0115 cor 18 47 34.27 -01 12 43.2           ~ 430 1
19 RAFGL 5541 Y*O 18 52 50.26 +00 55 29.6           ~ 122 1
20 IC 5146 OpC 21 53 29.3 +47 14 46           ~ 507 2

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